Effervescent tablet



FIG. 1 is a perspective front view of an effervescent tablet;

FIG. 2 is a front elevation view of the effervescent tablet; the rear elevation view being a mirror image thereof;

FIG. 3 is a left elevation view of the effervescent tablet; the right elevation view being a mirror image thereof;

FIG. 4 is a top elevation view of the effervescent tablet; and,

FIG. 5 is a bottom elevation view of the effervescent tablet.

The markings on the bottom of the effervescent tablet are shown in broken lines for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for an effervescent tablet, as shown and described. 